US3817964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyalkenamers
Assignee: Bayer AG
•
Filing: 1972-11-20
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Granted: 1974-06-18
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Expires: 1992-11-20
Abstract
Abstract Process for the ring opening polymerisation of cyclomonoolefins by contacting the cyclomonoolefins with a catalyst comsisting of A. A REACTION PRODUCT OF A TUNGSTEN OR TANTALUM HALIDE WITH AN ACETAL AND B. AN ORGANO COMPOUND OF A METAL OF GROUPS Ia to IVa of the Periodic Table THE MOLAR RATIO OF TUNGSTEN: METAL OF GROUPS Ia to IVa being from 1:03 to 1:10 and the molar ratio of tantalum: metal of groups Ia to IVa being from 1:1 to 1:10.
Inventors
- 👤 N Schoen
- 👤 D Theisen
- 👤 G Pampus
- 👤 J Witte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:47
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
18 words
A process according to claim 1 wherein said tungsten or tantalum halide is tungsten hexachloride or tantalum pentachloride.
Claim 2
Dependent Claim
21 words
A process according to claim 1 wherein said catalyst constituent b is an aluminum trialkyl, aluminumdialkylhalide or aluminumdihalide, or mixtures thereof.
Claim 3
Dependent Claim
11 words
A process according to claim 1 wherein said cyclomonoolefin is cyclopentene.
Claim 4
Dependent Claim
40 words
A process according to claim 1 wherein said cyclomonoolefin is a mixture of a cyclomonoolefin and not more than 30 percent by weight based on the total monomer mixture of a monocyclic or a polycyclic diolefin or an aliphatic diolefin.
References Cited (Backward Citations)
US3459725A
Cited
GB1062367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |